Air-injector.



E.. WERWATYH. AIRINJECTOR. l APPLIQATION FILED MAY 3l, 1906.

Patented NV. 10, 1908.

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ERICH WERWAIH, OF LINDEN, NEAR HANOVER, GERMANY.

AIR-INJ'E CTOR.

Specification of Letters Patent.

Patented Nov. 10, 1908.

Application led May 31, 1906. Serial No. 319,560.

To all whom t may concern:

Be it lmown that I, ERICH WERWATH, of Linden, a subject of the King ofPrussia, and whose post-office address is No. 1A Stephanusstrasse,Linden, near Hanover, Prussia, German Empire, have invented a new anduseful Air-Injector, of which the following is a specification.

This invention relates to air-injectors operated by means of steam orother working uids, and more particularly to such injectors as are usedin combination with boiler furnaces for the purpose of supplying thelatter for some time with air above the freshly charged layer of fuel,the injector being stopped when the fire appears on the surface of thefuel. As well known, the actual practice is to combine the said injectorwith means. dependent upon, or controlled by, the fire-door in such amanner that the act of opening the latter has the effect of connectingthe injector with a steam-supply or other working-fluid-supply, saidsupply being stopped again by the act of re-closing the re-door. In thiscombination the injector is left in free communication with theatmosphere during the periods of its rest, that is to say when thefire-door is closed and consequently there is no supply of steam orother working fluid. This has the effect that the draft of the chimneyacts to suck in air through the injector', so that a certain supply ofair to the Zone above the lire is continued. Now such continued supplyor air to the zone above the fire has the eect of rendering thecombustion uneconomical for the reason that this air does not assist thecombustion-process but attenuates the combustion-gases and therebyweakens the draft of the chimney.

It is the object of the present invention to do away with theinconvenience aboveexplained.

To this end, my invention provides, in combination with the injector andthe means for supplying the same with the working fluid, means under thecontrol of the working fluid for opening and re-closing the airinlet ofthe injector, so that said opening will be automatically closed by theact of stopping the working-fluid supply, and automatically reopened bythe act of starting the said supply. And in order that my presentinvention may be fully understood I proceed to describe the preferredform of practicing the same, reference being had to the annexed sheetsof drawings of which Figure lis a vertical central section of theapparatus with its movable parts in the position they take during theperiods of rest, and Fig. 2 a similar section showing the movable partsin the position they take after the supply of steam has been started. Inboth figures similar reference letters are used to indicate identicalparts, the -furnace, its connection with the apparatus and the steamsupply for the latter being omitted. a is a cylindrical box provided atone end with an air-inlet al and communicating through its opposite enda2 (the outer portion of which is broken away) with the furnace n otshown. In the axial line of this box is arranged a cylindrical chamber bopen at top and bottom and having an opening b1 in its side throughwhich it communicates with a pipe b2 penetrating through the side wallof the box a and communicating with a steam supply not shown. In theexample illustrated the chamber b and its supply-pipe b2 are shown ascast into one piece. In the top-opening of the chamber is fixed thereceiving end of the nozzle c, and in the bottom-opening is secured theinner open end of a cylindrical extension (Z having in its bottom anaxially placed opening (Z1. YVithin the chamber' b and its extension Zis arranged a hollow cylindrical slide or piston c which tightly fits tothe inner wall of the extension cl. The top of the piston is closed andformed with a short extension c1 of a smaller diameter. Within thepiston and in the axial line thereof is arranged a cylindrical stem jthe inner end of which is secured to the top of the piston, and theother end of which projects through the opening Z1 in the bottom of theextension d, the stem tightly fitting into said opening. lithin thepiston the stem f is surrounded by a spiral spring g one end of whichbears against the inner top wall of the piston c, while the other endbears against the bottom of the extension (Z. To the outer end of thestem f is fixed a plate or disk L having a somewhat larger diameter thanthe air-inlet c1 of the box a. The length of the stem f is such thatwhen it is in the position shown in Fig. 1, the disk /L is pressed uponthe air-inlet al, which may be provided with a recessed portion a3 (Fig.2) to form a seat for the said disk. Moreover in this position of theparts the piston e bears with its extension el against the inner end ofthe nozzle C thereby closing the latter and leaving a portion z' of thechamber in communication with the steam supply pipe b2.

Suppose the piston e be inthe position shown in Fig. l and steam besupplied through pipe b2. The steam penetrates into the portion e' ofthe chamber and by its pressure upon the top of the piston shifts thelatter back against the resistance of the spring g which is compressed.This shifting back of the piston has the effect of simultaneouslywithdrawing the extension c1 of the piston from the nozzle c and thedisk 7L from the air-inlet c1 so that a steam jet issues from the nozzleinto the portion a2 of the box a and air is drawn into the latterthrough its opening al and supplied to the furnace in well known manner.The parts of the apparatus are then in the position shown in Fig. 2 andare withheld in this position as long as the steam pressure is strongenough to maintain the spring g in its compressed state. As soon,however, as the steam pressure is weakened to such an amount as will beovercome by the tension of the spring, the latter will rexpand and indoing so it drives the piston forward into its starting position wherebythe disk 7L is re-closed upon the air inlet al, and the extension c1 ofthe piston upon the inner or receiving opening of the nozzle c.

I prefer to so bevel the edge of the pistonextension e1 that it canpenetrate to some extent into the receiving opening of the nozzle andtightly close the same for the purpose of preventing useless escape ofsteam after closure of the air-inlet al and of insuring that on startingthe steam supply the incoming steam is caused to act with its fullpressure upon the piston. The lower edge of the piston may also beprovided with a bevel to coperatie with a corresponding circumferentialincline at the bottom of the extension (l for preventing escape of steamalong the stem when t-he piston is in its lower position as in Fig. 2.

Instead of a disk plate or lid as 7L, any other convenient closing meansmay be used that are adapted to be controlled by the strokes of thepiston c, such as throttle valves and the like. I therefore wish it tobe understood that the term lid as used in the annexed claims isintended to comprise all forms and kinds of closing means or devicesadapted for the present purpose.

Obviously instead of steam compressed air and other suitable gases, andeven water may be used as the working fluid and therefore wish it to beunderstood, that my present invention shall not be bound to the use ofsteam as the working fluid.

Vhat I claim, and desire to secure by Letters Patent of the UnitedStates, is

l. The combination with the injector-noz#- zle, a box therefor having anair-inlet and air-outlet, and a pipe for supplying the noz-- zle withthe working fluid, of a lid adapted to close the air-inlet of said box,a piston connected with the lid, and a chamber closely surrounding thepiston and communicating with the said supply pipe, whereby saidairinlet is opened upon admission of working fluid to the injector-box,substantially as and for the purpose specified.

2. The combination with the injector-nozzle, a box therefor having anair-inlet and air-outlet, and a pipe for supplying the nozzle with theworking fluid, of a chamber intermediary and communicating with thenozzle and the pipe, a piston within the chamber, a lid adapted to closethe air-inlet of the box, a connection between the lid and the piston,whereby admission of working fluid to the nozzle acts on said piston toopen said air-inlet, and means for automatically returning the piston toits starting position when the supply of working fluid is cut off,substantially as and for the purpose specified.

3. The combination with the injector-nozzle, a box therefor having anair-inlet and air-outlet, and a pipe for supplying the nozzle with theworking fluid7 of a chamber intermediary and communicating with thenozzle and the pipe, a hollow piston within said chamber closed at itsinner end and open at its outer end, a stem axially arranged within thepiston and fixed to the inner end of the same, said intermediary chamberhaving an opening for the piston to project through, a lid fixed to thelower end of the stem and adapted to close the airinlet of said box,whereby admission of working fluid to the nozzle acts on said piston toopen said air-inlet, and means for automatically returning the piston toits starting position, substantially as and for the purpose specified.

4. The combination with the injector-noz.- zle, a box therefor having anair-inlet and air-outlet, and a pipe for supplying the nozzle with theworking fluid, of a chamber in` termediary and communicating with thenozzle and the pipe, a hollow piston within the chamber closed at itsinner end and open at its outer end, a stem axially arranged within thepiston and fixed to the inner end of the same, means whereby the pistonnormally closes the nozzle, a lid fixed to the outer end of the stem andadapted to close the air-inlet of said box, and a spiral springencircling said stem within the hollow piston and interposed between theinner endv of the piston and the outer end of its inclosing chamber,substantially as and for the purpose specified.

5. The combination with the injector-nozzle, a box therefor having anair-inlet and air-outlet, and a pipe for supplying the nozzle with theworking fluid, of a chamber intermediary and connnunicating with thenozzle and the pipe, a hollow piston within the chamber closed at itsinner end and open at its outer end, a stem axially arranged within thepiston and liXed to the inner end of the same, an opening in the outerend of the intermediary Chamber for the piston to proj eet through, alid iXed to the outer end of the stem and adapted to close the air-inletof said box, means for automatically returning the piston to itsstarting position, and mea-ns connected with the piston for closing Jchereceiving opening of the nozzle, substantially as and for the purposespecified.

G. The combination with the injector-nozzle, a box therefor having anair-inlet and air-outlet, and a pipe for supplying the nozzle with theworking-fluid, of a spring-aetuated piston having means for closing theentrance to the nozzle, and a lid operated thereby for Closing saidaiiililet, whereby admission of working-fluid under suticient pressureto overcome the spring will act on said piston to open the entrance tosaid nozzle and open said air-inlet.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ERICH VVERIVATH. lVitnesses WILH. G'LvroJ, WALTER C. SCHNEIDER.

